Roller bit



Nov. 1, 1927. 1,647,269

C. H. M. BULL ROLLER BIT Filed Aug. 15, 1927 2 Sheets-Sheet l gwuvntozEI-B 2 /JM +1. 714.3%

Nov. 1, 1927.

'2 Sheets-Sheet 2 C. H. M. BULL Filed 1 412.15, 1927 Patented Nov. 1927.

UNITED STATES PATENT orrics.

CLINTON H. M. BULL, OF HOUSTON, TEXAS, ASSIGNOR TO REED ROLLER. BITCOMPANY, OF HOUSTON, TEXAS, A CORPORATION OF TEXAS.

ROLLER BIT.

Application filed August 15, 1927. Serial No. 212,995.

' This invention relates to deep well drilllug apparatus, and moreparticularly to roller bits for use in rotary boring drills.

Roller bits have heretofore been v used wherein side -roller cutters andcross roller cutters have'been mounted, the former being positioned onthe sides of the head in planes converging in the head, and the latterextending diametrically across the head between the former and at rightangles thereto.

It is the object of this invention to provide a new and improved meanswhereby cross roller cutters can be mounted between and in the sametransverse plane with side roller cutters. s

The invention has as a further object the provision of a brace betweenthe spindles of roller cutters disposed on opposite sides of a head. Y

Another object of the invention is to provide a head and a spindlehaving new and improved cooperating elements, whereby a roller cuttercan be quickly and easily mounted in and removed from the head.

A further object of the invention the provision of a newand improvedsectional roller cutter.

Various objects, other than those above enumerated, will appear from thefollowing description and the accompanying drawngs.

Referring to the drawings, Fig. 1 1s a fragmentary and partly sectionalside elevation of the assembled bit; Fig. 2 .is a sectionon the line 2-2of Fig. 1; Fig. 3 is a diagrammatic bottom plan view; Fig. 4 is asection on the line 4-4 of Fig. l; and Fig. 5 is a section on the line5-5 of Fig. 1.

Referring more particularly to the drawings, a two-piece bit head isindicated at 1, the two parts of the head having grooves in the meetingfaces thereof adapted when alined to form slush course l". Each of thetwo pieces of head 1 has the inner side of the lower end thereof beveledas at 2, whereby the two pieces form a head having a substantiallV-shaped recess in the bottom thereof. T e outer sides of the lower endsof said pieces are recessed as shown at 3, and have bores 4;therethrough leadin downwardly and inwardly. Annular anges 5 .formed onsaid pieces project into the central recess of thehead adjacent bores 4.

Bushings 7 surround flanges 5. g

key 6 This key and slot construction is described and claimed in myapplication for Letters Patent of the United States filed March 28th,1927, Serial Number 178,987.

The side roller cutters may be of one-\ piece form as shown at 8, andheld on bushlng 7 by spindle 6, the bore of said cutter being "enlargedto receive the enlarged port1on 6 of spindle 6; orelse be made of twosections 9 and 9, similarly held on bushing 7 by spindle 6, the bore ofsection 9 being llkGWlSB. enlarged to receive enlarged portion 6 ofspindle 6. Section 9 has a circumferential recess adjacent its base toreceive section 9", as shown. The teeth of section 9 cut the side wallof the hole only. Under ordinary conditions, the teeth of section 9 willbecome dull sooner than will the teeth of section 9, and when thisoccurs, a new I section 9 can be used with original section 9 v Thelower ends of the parts of a twopiece bit head, and the correspondingdepending projections of'one-piece heads, are subjected to greatstrains, and at times bend inwardly, thereby putting an end to theefficient operation of the roller cutters carried thereby. Thisinvention provides new and improved means to positively preventsuchinward movement. L

Each of the enlarged portions 6 of spindles 6, has a substantiallycylindrical recess, and a socket in the lower wall of said recess toreceive one end of a pin 10, pin 10 having a plurality of frusto-conicalcross roller cutters 11 thereon, said cutters being of various lengthsso that trackin thereof will not occur, Pin 10 is locke against rotationin the sockets.

Pin 10 has screwed thereon, adjacent the ends thereof, bearing collars12, said collars snugly fitting the sockets in the lower walls of recess6".

To strongly support pin 10, rings are provided either integraltherewith, as shown at 10, or separate therefrom as shown at 13.Separate ring 13 is secured against rotation with respect to pin 10 bykey 14:. Referring particularly to Figs. 4 and 5, it w1ll be observedthat these rings are concentric with the surfaces of recesses 6 tosnugly fit the same. A rigid support is thereby provided.

The two innermost and abutting cutters of rollercutters 11, have theirmeeting faces grooved for the reception of a packing rin 15.

6H ducts '16 may be provided in the head 1 leading to the bearingsurfaces of the side roller cutters 8 and 9, and ducts 17 to crossroller cutters 11, as shown. 1

The drawings disclose, and this specificationdescribes, the preferredembodiment of the invention. It is to be understood that the hereinafterappearing claims are not l1m-. ited to the specific form shown, and thatvarious changes may be made without departure from the scope thereof.

Those skilled in the art will at once observe that the inventionprovides a new and improved arrangement of cutters, and new and improvedmeans to support the cutters so arranged.

I claim:

1. In a rotary boring drill, a head, spindles on said head, cutters onsaid spindles, and a brace between said spindles and having'its endsmounted thereon.

2. In a rotary boring drill, a head, sp ndles on said head havingrecesses therein, cutters on said spindles, and a removable bracebetween said spindles and havlng its ends resting in said recesses.

3. In a rotary boring drill, a head, .spindles on said head, cutters onsaid spindles, a brace between said spindles having its ends mountedthereon, and means to prevent lateral movement of said brace.

4. In a rotary boring drill, a head, a spindle on one side of said head,a cutter on said spindle, and a brace extendmg from said spindle to theother side of the head.

5. In a rotary boring drill, a head, a

spindle on one side of said head, a cutteIO p on said spindle, a braceextending from said spindle to the other side of the head, and means toprevent lateral movement of sa1d brace.

6. In a rotary boring drill, a head, inwardly projecting spindles on thesides of said head, said spindles having recesses in their inner endsand pockets in the walls of said recesses, cutters on said spindles, anda brace having its ends extending into said recesses and fittin in saidpockets.

7. In a rotary oring drill, a head, Inwardly projecting spindles on thesides of said head, said spindles having-recesses in their inner ends,cutters on said spindles,

and a brace, having its ends fitting in said recesses and extensionsresting on the walls of said recesses to support said brace.

S. In a rotary boring drill, a head, inwardly projecting spindles on thesides of said head, said spindles having recesses in their inner ends,cutters'on said spindles, and a brace having its ends fitting in saidrecesses and having concentric rings resting on the walls of saidrecesses to support said brace.

9. In a rotary boring drill, a head, side roller cutters mounted on thesides of said head, and cross roller cutters mounted between said sideroller cutters and extending from one side roller cutter to another.

10. In a rotary boring drill, a head, spindles on the, sides of saidhead, side roller cutters on said spindles, a pin having its endsattached to said spindles, and cross roller cutters'on said pin.

11. In a rotary boring drill, ahead, spindles on the sides of said head,side roller cutters on said spindles, a pin having its ends attached tosaid spindles, means to prevent lateral movement of said pin, and crossroller cutters on said pin."

12. In a rotary boring drill, a head, in-

wardly projecting spindles on the sides of said head, said spindleshaving sockets therein, a in having its ends fitting in said sockets, sie roller cutters on said spindles,

and cross roller cutters on said pin.

13. In a rotary boring drill, a head, inwardly projecting spindles onsaid head, said spindles having recesses therein, a pin having its endsfitting in said recesses and having extensions resting against the wallsof said recesses to support said pin, side roller cutters on saidspindles, and cross roller cutters on said pin.

14. In a rotary boring drill, a head, inwardly projecting spindles onsaid head, said spindles having recesses therein, a pin having its endsfitting in said recesses and having concentric rings thereon, said ringsresting against the walls of said recesses to support said pin, sideroller cutters on said spindles, and cross roller cutters on said 15. Ina rotary boring drill, a head, a

spindle on one side of said head, a side roller cutter on said spindle,a pin having one end attached to said spindle and the other endsupported in the other side of said head, and cross roller cutters onsaid pin.

16. In a rotary boring drill, a head, a spindle on one side of saidhead, a side roller cutter on said spindle, a pin having one endattached to said spindle, means to prevent lateral movement of said pin,and cross roller cutters on said pin.

17. In a rotary boring drill, a head, spindle onsaid head, and a cutteron said spindle, said cutter being made of two separable sections, oneof said sections havin a circumferential oove in one end thereo and theother of said sections being mounted in said groove. I

18. In a rotary boring drill, a head, a. spindle on said head, and acutter on said spindle, said cutter being made of two separablesections, one of said sections having teeth operating on the bottom ofthe hole and the other of said sections having teeth operating on theside of thehole.

19. In a rotary boring drill, a head, a spindle on said head, a sideroller cutter on said spindle, a pin having one end mounted in saidspindle, and cross roller cutters 15 mounted on said pin immediatelyadjacent 2 each other, the adjacent faces of said cutters being grooved,and a packing ring between said cutters and fitting in the grooves ofsaid faces.

In testimony whereof, I hereunto affix my 2 signature.

CLINTON H. M. BULL.

